Sur Ron motor shaft becoming hot

Doctorbass

100 GW
Joined
Apr 8, 2007
Messages
7,495
Location
Quebec, Canada East
Hello guys,

I got a Sur ron motor and controller recently to play with.

I discovered that when running no load, the shaft is becoming significantly hot! I know that running a motor no load without power produced is a like a pure noise and heat generator and all energy is likely going into heat, but it was interesting to see that the shaft too was becoming hot.

I have two hypothesis:

1: the bearing ad significant friction and generate heat ( maybe the seal?)
2: the eddy current loss are quite high in that motor and the rotor design is not so optimized for good mag flux path...? ( magnet seem pretty normal arrangement inside, no ipm,

Even Bruno noticed that and this gave me a clue that this is not an isolated case...

https://youtu.be/aRzmNqAuEhQ?t=306

Did some of you guys experienced that?

Doc
 
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